The top floor is only accessible by an internal stair from the unit below.The top floor does not contain any sleeping rooms.The top floor contains only 375 sf of space representing a code occupancy of 2 persons.In this case the top floor is very small and more like a penthouse than a true fourth floor. The code requirements for a fourth floor are based on an assumption that the fourth floor is substantial with many occupants. Note that the addition is on to an existing three story historic building with brick exterior built prior to modern codes but which per the IEBC qualifies as V-A construction.
The entire addition is sprinklered with 13R.
The entire addition is constructed Type V-A as required for four floors, even though as described above, the fourth floor is just 375 sf of space accessible only from within the unit below. Also interpretation of 903.2.8.5 as to 50% rule is before or after the addition.Ĭonsider the 13R sprinkler with Type V-A construction throughout (as required for 4th floor) as equivalent fire and life safety due to the very small size of the fourth floor space, the small number of occupants, and that the stair to that space is within a unit accessed from the third floor. See Fire Marshal Jenning's plan check Item 2.Ĭode Guide: Fire Sprinkler Requirements for R Occupancy, IBC/9#2:Ĭondition 3 says for new dwelling units in existing buildings #2 says units not located more than 3 stories above grade.
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